Affiliation: | 1. Health Research Center, Okayama University, 1-1, 2 chome, Tsushima-Naka, 700, Okayama, Japan 2. Health Research Center, Okayama University, 700, Okayama, Japan 3. Department of Internal Medicine, Kumayama Municipal Hospital, 709-07, Okayama, Japan 4. 1st Department of Internal Medicine, Okayama University Medical School, 700, Okayama, Japan
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